[libvirt] [PATCH 0/4] PCI multifunction partial assignment support

[Daniel Henrique Barboza]

On 10/10/19 9:27 PM, Abdulla Bubshait wrote:
> On Mon,  7 Oct 2019 18:11:32 -0300
> Daniel Henrique Barboza <danielhb413 gmail com> wrote:
> > These series tries to solve the partial assignment of multifunction
> > hostdev PCI devices by introducing a new hostdev attribute called
> > 'assigned'. This is how it works:
> > 
> > - it is a boolean value that will be efffective just for
> > multifunction hostdev PCI devices, since there's no other
> > occurrence for this kind of use in Libvirt. Trying to
> > declare assign='yes|no' in any other PCI hostdev device
> > will cause parse errors;
> I think this functionality should be available to all hostdev PCI
> devices and not just multifunction ones. You might have several
> devices that are part of the same IOMMU group that you don't mind
> giving up from the host, but don't want to supply all of them to the
> guest. This would be an alternative to using ACS patch in these
> situations.
>
> One example is having two nvme drives in a single IOMMU group, you
> will be able to pass a single one to the guest rather than being
> forced to pass both.

You're right. This can be extended to all PCI hostdev devices. The
conditions that I'm handling here (detaching/reattaching all the
devices that belongs in the same IOMMU) isn't exclusive to PCI
multifunction devices.

Thanks for the input. I'll re-spin this series considering all PCI hostdev
devices this time.


DHB



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